Abstract
Excited states in 63,65,67Mn were studied via in-beam γ-ray spectroscopy following knockout reactions from 68Fe. Similar level schemes, consisting of the 11/2−, 9/2−, 7/2− and 5/2−g,s. level sequence, connected by I → I–1 transitions, were established. Their level structures show features consistent with strongly-coupled rotational bands with K = 5/2.
Highlights
At the N = 40 harmonic oscillator shell closure, 68Ni has the appearance of being doubly magic based on the high 2+1 energy and a low transition probability
The experiment was performed at the Radioactive Isotope Beam Factory (RIBF)
The secondary reaction residues were produced via proton-induced knockout reactions
Summary
At the N = 40 harmonic oscillator shell closure, 68Ni has the appearance of being doubly magic based on the high 2+1 energy and a low transition probability. Well deformed low-lying states with considerable particle-hole excitation strength across the N = 40 gap have been observed and/or predicted in the nuclei around 68Ni, described as a new “island of inversion" [1].
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